How acoustic detection confirms a leak when moisture readings are high

Full transcript

George and Dave in conversation. Every word of the episode, exactly as recorded.

George

Welcome to the ADI Leak Detection podcast. I'm here with Dave from ADI Leak Detection, leading leak detection specialists across the UK, who's here to answer your questions and provide expert leak detection advice. Today's question is one we hear a lot from homeowners: your moisture meter is screaming at you, readings are high, but how do you actually find where the water's coming from? Dave, over to you.

Dave

Right, so a moisture meter is brilliant for telling you that water is present somewhere in a wall or a floor. What it can't do is tell you why it's there or where the source is. That's the gap acoustic detection fills.

George

So the moisture reading is almost like a symptom rather than a diagnosis?

Dave

Exactly. High moisture readings could mean an active pipe leak, residual damp from a leak that's already been repaired, condensation build-up, or even water tracking in from outside. If you dig up the floor based on a moisture reading alone, you're essentially guessing. Acoustic equipment removes the guesswork.

George

Walk me through what acoustic detection actually involves. What are the engineers doing on site?

Dave

ADI's engineers place sensitive ground microphones at multiple points along the pipe run, valves, joints, stop taps, anywhere there's access. Each microphone picks up vibrations travelling through the pipe and through the ground above it. Escaping water under pressure creates a very specific sound signature, and the equipment distinguishes that from background noise like traffic or central heating.

George

So it's not just listening for a drip? There's some real science in the signal itself?

Dave

There is. The technique ADI uses most often for supply pipes is acoustic correlation. Two sensors are placed either side of a suspect section of pipe, and a correlator unit compares the time difference in the sound signal arriving at each sensor. From that timing difference and the known pipe diameter and material, the correlator calculates the precise distance to the leak. It's accurate to within a few centimetres in most conditions.

George

That's impressive. And this works even under a concrete floor or under the garden?

Dave

Yes, the acoustic signal travels through the ground. ADI Leak Detection uses correlators designed for UK residential pipe materials, copper, plastic, lead-lined, because each material transmits sound differently, and the equipment needs to account for that. Plastic pipe absorbs more sound than copper, so the sensitivity settings change depending on what's in the ground.

George

And where does thermal imaging sit alongside all this? I know ADI uses that as well.

Dave

Thermal imaging is useful where water is escaping and warming or cooling the surrounding structure, so underfloor heating leaks are a good example, because the water is warm and the thermal camera maps exactly where it's pooling under the screed. For cold supply pipe leaks, acoustic correlation is often the lead method, and thermal imaging confirms what the acoustic survey has found. The two methods work together.

George

So in a real job, you might use both in the same visit?

Dave

Routinely. ADI's engineers carry thermal imaging cameras and acoustic equipment on the same call-out. If a moisture survey has flagged a wet area in a kitchen, we'll scan the floor thermally to see if there's a temperature anomaly, then correlate acoustically to confirm the leak point on the supply or the underfloor pipework. That combination means we can mark the floor for a targeted, minimal excavation rather than lifting a wide area on spec.

George

For homeowners listening, is there anything they can do before ADI arrives that helps the process?

Dave

The most helpful thing is to turn off anything that cycles on and off, dishwashers, washing machines, the boiler if it's safe to do so. Acoustic surveys work best when the only sound in the pipe network is the leak itself. Background water noise from appliances running during a survey makes the correlator's job harder and can shift the calculated leak position slightly.

George

Really useful, Dave, thank you. So the short version is: moisture readings tell you there's a problem, acoustic correlation tells you exactly where it is, and when you combine that with thermal imaging you can go in and fix it without tearing the whole floor up.

Dave

That's it. Precise detection means precise repair. One targeted hole beats ten random ones every time.

George

Brilliant. Thanks for listening, if you've got high moisture readings and need a confirmed leak location, ADI Leak Detection are one of the UK's most established and trusted names in residential water leak detection. We'll be back with more from Dave soon.

How this episode was made. This episode was produced using AI-generated voices and script, based on real leak detection questions and the working knowledge of ADI Leak Detection engineers. More about how the podcast is made.